Regional variation of whole rock chemistry of the Miocene felsic igneous rocks in the Kii Peninsula, southwest Japan

Shinjoe, Hironao; Orihashi, Yuji; Wada, Yutaka; Sumii, Tomoaki; Nakai, S.

doi:10.5575/geosoc.113.310

Cited by 19 publications

(30 citation statements)

References 48 publications

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“…4 and 5b). Compared with calc-alkaline granite and rhyolite (Crecraft et al, 1981;Norman et al, 1992;Gerber et al, 1995;Miller and Hoisch, 1995;Petford and Atherton, 1996;Kawano et al, 1997;Shinjoe, 1997;Anma et al, 1998;Parada et al, 1999;Halla, 2005;Masberg et al, 2005;Shinjoe et al, 2007), the Taitao granitoids have high Al 2 O 3 , MgO and Na 2 O contents, and low FeO* and K 2 O contents and K/Na ratio (Fig. 4).…”

Section: Major Element Compositions Of Taitao Granitoidsmentioning

confidence: 99%

Petrogenesis of the ridge subduction-related granitoids from the Taitao Peninsula, Chile Triple Junction Area

et al. 2013

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Section: Major Element Compositions Of Taitao Granitoidsmentioning

confidence: 99%

Petrogenesis of the ridge subduction-related granitoids from the Taitao Peninsula, Chile Triple Junction Area

et al. 2013

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“… Harker’s variation diagrams for the Tsushima granites. The shaded area represents major element composition of the Outer Zone granites (Tateishi et al , 1986; Terakado et al , 1988; Yamamoto et al , 1988; Dai et al , 1993; Yoshida et al , 1993; Shinjoe, 1997; Anma et al , 1998; Shinjoe et al , 2007). (a) Fe 2 O 3 T , r 2 = 0.98; (b) TiO 2 , r 2 = 0.95; (c) CaO, r 2 = 0.94; (d) MgO, r 2 = 0.95; (e) Al 2 O 3 , r 2 = 0.89; (f) MnO, r 2 = 0.81; (g) P 2 O 5 , r 2 = 0.80; (h) K 2 O, r 2 = 0.70; (i) Na 2 O, r 2 = 0.43.…”

Section: Resultsmentioning

confidence: 99%

“… Trace‐element variation diagrams for the Tsushima granites. The shaded area represents trace element composition of the Outer Zone granites (Terakado et al , 1988; Dai et al , 1993; Yoshida et al , 1993; Shinjoe, 1997; Anma et al , 1998; Shinjoe et al , 2007). (a) Ba; (b) Th; (c) Pb; (d) Rb; (e) Sc; (f) Nd; (g) Sr; (h) Zr; (i) Yb; (j) Rb/Sr; (k) (La/Yb) N .…”

Section: Resultsmentioning

confidence: 99%

Genesis and Mixing/Mingling of Mafic and Felsic Magmas of Back‐Arc Granite: Miocene Tsushima Pluton, Southwest Japan

et al. 2009

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The Middle Miocene Tsushima granite pluton is composed of leucocratic granites, gray granites and numerous mafi c microgranular enclaves (MME). The granites have a metaluminous to slightly peraluminous composition and belong to the calc-alkaline series, as do many other coeval granites of southwestern Japan, all of which formed in relation to the opening of the Sea of Japan. The Tsushima granites are unique in that they occur in the back-arc area of the innermost Inner Zone of Southwest Japan, contain numerous miarolitic cavities, and show shallow crystallization (2 -6 km deep), based on hornblende geobarometry. The leucocratic granite has higher initial 87 Sr/ 86 Sr ratios (0.7065 -0.7085) and lower Nd(t) (−7.70 to −4.35) than the MME of basaltic -dacitic composition (0.7044 -0.7061 and −0.53 to −5.24), whereas most gray granites have intermediate chemical and Sr -Nd isotopic compositions (0.7061 -0.7072 and −3.75 to −6.17). Field, petrological, and geochemical data demonstrate that the Tsushima granites formed by the mingling and mixing of mafi c and felsic magmas. The Sr -Nd -Pb isotope data strongly suggest that the mafi c magma was derived from two mantle components with depleted mantle material and enriched mantle I (EMI) compositions, whereas the felsic magma formed by mixing of upper mantle magma of EMI composition with metabasic rocks in the overlying lower crust. Element data points deviating from the simple mixing line of the two magmas may indicate fractional crystallization of the felsic magma or chemical modifi cation by hydrothermal fl uid. The miarolitic cavities and enrichment of alkali elements in the MME suggest rapid cooling of the mingled magma accompanied by elemental transport by hydrothermal fl uid. The inferred genesis of this magma -fl uid system is as follows: (i) the mafi c and felsic magmas were generated in the mantle and lower crust, respectively, by a large heat supply and pressure decrease under back-arc conditions induced by mantle upwelling and crustal thinning; (ii) they mingled and crystallized rapidly at shallow depths in the upper crust without interaction during the ascent of the magmas from the middle to the upper crust, which (iii) led to fl uid generation in the shallow crust. The upper mantle in southwest Japan thus has an EMI-like composition, which plays an important role in the genesis of igneous rocks there.

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“…However, Tatsumi et al (2001) concluded that the silicic magmatism in the SVB becomes progressively younger towards the north from 14.5 to 12.0 Ma, which is regarded as representing the leading edge of the subducting Philippine Sea Plate (Tatsumi et al, 2001). Later, Tatsumi et al, (2010) re-examined the Shodoshima rhyolite, representing the earliest stage of volcanism on the island, with zircon U-Pb geochronology and determined its age to be 14.4 to 14.3 Ma, while much younger K-Ar ages, 12.0 and FIGURE 1 (a) Location map of the Setouchi volcanic rocks and Outer Zone acidic rocks in the Southwest Japan Arc based on Nakada and Takahashi (1979), Tatsumi and Yokoyama (1978), Shinjoe, Orihashi, Wada, Sumii, and Nakai (2007) and Isozaki et al (2010). The distribution of the Setouchi volcanic rocks is based on Tatsumi et al (2010): 1, Northeast Kyushu; 2, Northwest Shikoku; 3, Northeast Shikoku; 4, Osaka; and 5, Shitara.…”

Section: Geological Settingmentioning

confidence: 99%

“…(a) Location map of the Setouchi volcanic rocks and Outer Zone acidic rocks in the Southwest Japan Arc based on Nakada and Takahashi (), Tatsumi and Yokoyama (), Shinjoe, Orihashi, Wada, Sumii, and Nakai () and Isozaki et al (). The distribution of the Setouchi volcanic rocks is based on Tatsumi et al (): 1, Northeast Kyushu; 2, Northwest Shikoku; 3, Northeast Shikoku; 4, Osaka; and 5, Shitara.…”

Section: Introductionmentioning

confidence: 99%

Timescale of magma chamber processes revealed by U–Pb ages, trace element contents and morphology of zircons from the Ishizuchi caldera, Southwest Japan Arc

et al. 2017

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U–Pb geochronology and trace element chemistry of zircons in a microscale analysis were applied to the Ishizuchi caldera in the Outer Zone of Southwest Japan in order to estimate the timescale of the magma process, in particular, the magma differentiation. This caldera is composed mainly of ring fault complexes, major pyroclastic flow deposits, and felsic intrusion including central plutons. Using SHRIMP‐IIe, our new U–Pb zircon ages obtained from the major pyroclastic flow deposits (Tengudake pyroclastic flow deposits), granitic rocks from central plutons (Soushikei granodiorite and Teppoishigawa quartz monzonite), and rhyolite from the outer ring dike (Tenchuseki rhyolite) and the inner ring dike (Bansyodani rhyolite) are 14.80 ±0.11 Ma, 14.56 ±0.10 Ma, 14.53 ±0.12 Ma, 14.55 ±0.11 Ma and 14.21 ±0.19 Ma, respectively. Based on the U–Pb ages, the Hf contents and the REE patterns of the zircons, three stages are recognized in the evolutionary history of the magma chamber beneath the Ishizuchi caldera: (i) climactic Tengudake pyroclastic flow eruption; (ii) Tenchuseki rhyolite intrusion into the outer ring dike and central pluton intrusion; and (iii) Bansyodani rhyolite intrusion in the inner ring dike. These results indicate a magma evolution history of the Ishizuchi caldera system which took at least ca 600 kyr from the climatic caldera‐forming eruption to the post‐caldera intrusions. Our new geochronological data suggest that the Ishizuchi caldera formed as part of the voluminous and episodic magmatism that occurred in the wide zone along the Miocene forearc basin of Southwest Japan during the inception of the young Philippine Sea Plate subduction.

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Regional variation of whole rock chemistry of the Miocene felsic igneous rocks in the Kii Peninsula, southwest Japan

Cited by 19 publications

References 48 publications

Petrogenesis of the ridge subduction-related granitoids from the Taitao Peninsula, Chile Triple Junction Area

Petrogenesis of the ridge subduction-related granitoids from the Taitao Peninsula, Chile Triple Junction Area

Genesis and Mixing/Mingling of Mafic and Felsic Magmas of Back‐Arc Granite: Miocene Tsushima Pluton, Southwest Japan

Timescale of magma chamber processes revealed by U–Pb ages, trace element contents and morphology of zircons from the Ishizuchi caldera, Southwest Japan Arc

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